<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>对象无序</title>
</head>
<body>
    <script>
        let obj = {
            "3":"3333",
            "2":"2222",
            "1":"1111",
            "4":"4444"
        }
        // console.log(obj);
        console.log(Object.keys(obj));
    </script>
</body>
</html>